Screw thread balanced type float valve
Technical field
The utility model relates to float valve, refers to a kind of screw thread balanced type float valve particularly.
Background technique
The float valve of present domestic manufacturing can be divided into two kinds, and a kind of is common float valve, and its principle is that pond liquid level raises, and the buoyancy of ball float is closed main valve, and when pond liquid level decline, the gravity of ball float is opened main valve and supplied water.Another kind is a liquid level float ball valve up and down, but liquid level control function must lean on pressure or external pressure source before the valve to realize up and down, as the very little (P<0.6Mpa) or without any pressure the time, the function of this float valve can't realize of upstream pressure.
Summary of the invention
The purpose of this utility model will overcome the existing in prior technology deficiency exactly, and a kind of screw thread balanced type float valve is provided, and very little (P<0.6Mpa) or do not have the situation of pressure also can realize liquid level control function up and down at upstream pressure.
For achieving the above object, the screw thread balanced type float valve that the utility model is designed, comprise main valve, drive link, ball lever and ball float, described main valve comprises three-way type valve body, valve seat, plunger, guide sleeve and valve gap, guide sleeve is fixed in the three-way type valve body, plunger is arranged on guide sleeve inside, the center of plunger is provided with central shaft, one end of described central shaft is piercing in plunger, and be connected with fixed plate in the lower end of central shaft, the other end of described central shaft is piercing in valve gap, and is provided with strong magnets in the upper end of central shaft; Described valve gap and the screwed connection of three-way type valve body; Described drive link is connected with the central shaft of main valve by first bearing pin away from an end of ball lever, and is connected with the valve gap of main valve by second bearing pin.
Preferably, it also comprises the fixed cover device, and the outlet conduit of an end of described fixed cover device and below, the waterexit end of three-way type valve body is fixed, and the other end is provided with the loose slot that penetrates for ball lever.Like this, the fixed cover device can guarantee that ball float only does up and down telemechanical, and ball lever can not tilt significantly.
Preferably, described drive link also is provided with balancing weight away from an end of ball lever.Like this, the gravity that balancing weight can balance drive link self.
Preferably, the middle part of described ball lever is provided with upper limit position block, and the bottom is provided with lower position block, and described upper limit position block is positioned at the below of loose slot.Like this, ball float can be controlled the opening and closing of ball float main valve better free movable between two limiting stoppers up and down.
Preferably, the central channel of described plunger head is provided with sealing gasket.Be sealedly connected with axle sleeve in the center hole of described valve gap.Between described axle sleeve and the central shaft, between valve gap and the three-way type valve body, all adopt the sealing of O type circle between plunger and the guide sleeve.Like this, the inner sealing performance of main valve is better, has adopted the balanced type piston structure, has reduced the hoisting capacity and the slip resistance of plunger as far as possible, and very little by the moment of ball float opening and closing, ball float can directly be controlled the opening and closing of ball float main valve.
Preferably, described valve gap adopts and can be contained the metallic material that magnetizes thing by what strong magnets attracted.Like this, can produce stronger magnetic force between valve gap and the strong magnets.
The beneficial effects of the utility model are: be added with strong magnets on the central shaft of main valve, even do not having under the situation of pressing, float valve also can be realized liquid level control function up and down; Adopted the leading type sealing, when the ball float main valve was opened, the leading type sealing was opened earlier, and after chamber pressure to be controlled discharged, main valve is complete opening again; When float valve will be closed, the leading type sealing was closed earlier, and upstream pressure enters control chamber, main valve is closed under the pressure of control chamber and ball float buoyancy, like this, main valve has before valve under the low pressure situation, and the main valve opening and closing can be carried out switch by the pressure of feed-water end.Very little (P<0.6Mpa) or do not have the situation of pressure has liquid level control function up and down to the utility model too, and liquid level can be regulated up and down, and the function of float valve is not subjected to the influence of the feed-water end pressure surge of main valve at upstream pressure.
Description of drawings
Fig. 1 is the structural representation of screw thread balanced type float valve.
Fig. 2 is the structural representation of the main valve of screw thread balanced type float valve.
Fig. 3 is the utilization structure schematic representation of screw thread balanced type float valve.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Screw thread balanced type float valve shown in the figure comprises main valve 1, drive link 2, ball lever 3 and ball float 4.Main valve 1 comprises three-way type valve body 1.1, valve seat 1.2, plunger 1.3, guide sleeve 1.5 and valve gap 1.8, guide sleeve 1.5 is fixed in the three-way type valve body 1.1, plunger 1.3 is arranged on guide sleeve 1.5 inside, the center of plunger 1.3 is provided with central shaft 1.7, one end of central shaft 1.7 is piercing in plunger 1.3, and being connected with fixed plate 1.4 in the lower end of central shaft 1.7, the other end of central shaft 1.7 is piercing in valve gap 1.8, and is provided with strong magnets 1.10 in the upper end of central shaft 1.7.Valve gap 1.8 and 1.1 screwed connections of three-way type valve body.Drive link 2 is connected with the central shaft 1.7 of main valve 1 by first bearing pin 5 away from an end of ball lever 3, and is connected with the valve gap 1.8 of main valve 1 by second bearing pin 6.Drive link 2 also is provided with balancing weight 8 away from an end of ball lever 3.Screw thread balanced type float valve also comprises fixed cover device 7, and the outlet conduit 9 of an end of fixed cover device 7 and below, the waterexit end of three-way type valve body 1.1 is fixing, and the other end is provided with the loose slot 7.1 that penetrates for ball lever 3.The middle part of ball lever 3 is provided with upper limit position block 3.1, and the bottom is provided with lower position block 3.2, and upper limit position block 3.1 is positioned at the below of loose slot 7.1.The central channel at plunger 1.3 tops is provided with sealing gasket 1.6.Be sealedly connected with axle sleeve 1.9 in the center hole of valve gap 1.8.Between axle sleeve 1.9 and the central shaft 1.7, between valve gap 1.8 and the three-way type valve body 1.1, all adopt the sealing of O type circle between plunger 1.3 and the guide sleeve 1.5.Valve gap 1.8 adopts and can be contained the metallic material that magnetizes thing by what strong magnets 1.10 attracted.
During assembling: earlier rubber valve seat 1.2 is placed in the trough of three-way type valve body 1.1, guide sleeve 1.5 is placed in the valve and is pressing rubber valve seat 1.2.Sealing gasket 1.6 is bonded in the central channel at plunger 1.3 tops, central shaft 1.7 penetrates from the center hole of plunger 1.3, and fixed plate 1.4 penetrates and use nut check from this end again.Plunger 1.3 is packed in the guide sleeve 1.5, and plunger 1.3 can be free to slide in guide sleeve 1.5, adopts the sealing of O type circle between plunger 1.3 and the guide sleeve 1.5.Axle sleeve 1.9 external surface coating sealers are packed in the center hole of valve gap 1.8, again valve gap 1.8 are penetrated central shaft 1.7 and rotation is fixed on the valve body, between axle sleeve 1.9 and the central shaft 1.7, all adopt O type circle to seal between valve gap 1.8 and the valve body 1.1.More than finish the assembling of the main valve of screw thread balanced type float valve, specifically as shown in Figure 2.Outside leverage specifically as shown in Figure 1.Adopt bearing pin 5,6 to be connected between drive link 2 and the main valve 1, balancing weight 8 is used for the gravity of balance drive link 2 self; Fixed cover device 7 is fixed on the outlet conduit 9 of waterexit end below of float valve main valve 1, and ball lever 3 penetrates in the loose slot 7.1 of the other end of fixed cover device 7.
Working principle:
As shown in Figure 3, the main valve 1 inner equalizing piston formula control structure that adopts, ball float 4 is by the opening and closing of drive link 2 and ball lever 3 control main valves, ball float 4 is free movable between two limiting stoppers 3.1,3.2 up and down, distance H between upper and lower spacing 3.1,3.2 is the difference of liquid level of float valve control, and difference of liquid level H value can Field adjustment.In the time of the drawdown in the water tank 10, ball float 4 falls, be added with strong magnets 1.10 on the central shaft 1.7 because of main valve 1, when main valve 1 is in the closed position, inhale mutually between strong magnets 1.10 and the valve gap 1.8, after ball float 4 descends, the position that main valve 1 is closed by the magnetic force maintenance of magnet, have only when ball float 4 is fallen lower position block 3.2, the gravity of ball float 4 will overcome magnetic force, and opens main valve.When the water level in the water tank 10 rises, ball float 4 is floated, but this moment, main valve 1 was still for being in opening state, when upper limit position block 3.1 is run in ball float 4 risings, because the pressure that magnetic force between buoyancy, strong magnets 1.10 and the valve gap 1.8 of ball float 4 and main valve 1 feed-water end water inwardly impact is slowly closed main valve 1.